JP4574801B2 - Liquefied gas mixing equipment - Google Patents

Description

【００４５】
プロパン（ａ）、ブタン（ｂ）、ジメチルエーテル（ｃ）はそれぞれの貯蔵タンク１ａ、１ｂ、１ｃに貯蔵されており、送液手段２ａ、２ｂ、２ｃによって１．１ＭＰａまで加圧されて個別配管ＩＬａ、ＩＬｂ、ＩＬｃに供給し、リサイクル手段Ｒａ、Ｒｂ、Ｒｃ内をリサイクルさせた。この時、流量制御弁４ａ、４ｂ、４ｃに付属する流量調節計５ａ、５ｂ、５ｃには各液化ガスが上記重量％となるように設定値が入力されており、質量流量測定器３ａ、３ｂ、３ｃ（オーバル社製、マイクロモーション流量計）によって測定された各液化ガスの測定値が、上記の設定値と等しくなるよう各液化ガスの流量が制御された。また、リサイクル手段Ｒａ、Ｒｂ、Ｒｃの圧力は圧力調整器８ａ、８ｂ、８ｃによって、それぞれ１．０５ＭＰａに設定された。
【００４６】
上記リサイクルを２分行なった後に、各液化ガスの質量流量の測定値が設定値と等しくなった時点で、リサイクル配管ＲＬａ、ＲＬｂ、ＲＬｃを流れる各液化ガスの流れを共通配管ＣＬに切替えた。切替指示はタイマによって行ない、開閉弁６ａ、６ｂ、６ｃを同時に閉とするとともに、開閉弁７ａ、７ｂ、７ｃを同時に開とし、３種類の液化ガスを共通配管ＣＬに導入した。
【００４７】
各液化ガスはまず、第１の混合器９で混合された後、第２の混合器１０でさらに混合された。第２の混合器１０としては、静止型混合器（（株）ノリタケカンパニーリミテド製、ノリタケスタティックミキサ）を用いた。上記の第１の混合器９、第２の混合器１０によって混合され、共通配管ＣＬに供給されるとともに混合された混合液化ガスは貯留手段１１に貯留された。貯留手段１１は窒素ガスによって、１ＭＰａの一定圧力に保持された。
【００４８】
一方、混合液化ガスを貯留手段１１に貯留する間、第２の混合器１０の出口から、混合された液化ガスをサンプリングし、ガスクロマトグラフィにより各成分を分析したところ、表２に示す測定値が得られた。
【００４９】
【表２】

【００５０】
この結果から、本発明を実施することにより、バッチ的に耐圧容器に各成分を、蒸気圧の低い順に一成分ずつ計量して仕込み、振とう、撹拌する従来法とほぼ、同一精度で液化ガスの混合ができることが明らかとなった。
【００５１】
【発明の効果】
以上述べたように、本発明により、液化ガスの混合を必要な時に必要な量だけ、オンサイトで、コンパクトな装置によって行なうことができる。その結果、例えば、従来エアゾル噴射剤を各処方毎にバッチ的に数種類の液化ガスを混合し、それらを各タンクに貯蔵するといった設備的、スペース的な無駄を省くことが可能となった。
【図面の簡単な説明】
【図１】 本発明の第１の実施形態を示すフローチャートである。
【図２】 本発明の第２の実施形態を示すフローチャートである。
【図３】 本発明の第３の実施形態を示すフローチャートである。
【符号の説明】
１ａ、１ｂ、１ｃ 液化ガス貯蔵タンク（供給源）
２ａ、２ｂ、２ｃ 送液手段
３ａ、３ｂ、３ｃ 質量流量測定器
４ａ、４ｂ、４ｃ 質量流量制御弁
５ａ、５ｂ、５ｃ 流量調節計
６ａ、６ｂ、６ｃ 開閉弁
７ａ、７ｂ、７ｃ 開閉弁
８ａ、８ｂ、８ｃ 圧力調整器
９ 第１の混合器
１０ 第２の混合器
１１ 貯留手段
１２ 液面検出器
１３、１４ 圧力調節弁
１５ 圧力調節計
１６ 遮断弁
１７、１８ 加圧手段
１９、２０ 切替弁
ＩＬａ、ＩＬｂ、ＩＬｃ 個別配管
ＣＬ 共通配管
ＲＬａ、ＲＬｂ、ＲＬｃ リサイクル配管
Ｒａ、Ｒｂ、Ｒｃ リサイクル手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for mixing two or more liquefied gases. In particular, the present invention relates to an apparatus for mixing two or more liquefied gases that are constituents of an aerosol propellant.
[0002]
[Prior art]
Aerosol products filled in spray cans so that the main components such as insecticides, paints, cosmetics, deodorants and pharmaceuticals can be dissolved in alcohol, methylene chloride, methylchloroform, kerosene, etc. In recent years, its use has been expanding. However, as the use of aerosol products is diversified, various types of propellants with different filling pressures and spraying pressures in spray cans are desired.
[0003]
Conventionally, a desired propellant has a low saturated vapor pressure in a pressure-resistant container so that a desired filling pressure, an injection pressure, and the like are obtained when several types of propellant component gases are filled in a spray can. It was filled in a liquid state in order, shaken and stirred to obtain a uniform mixed solution, and then transferred to a tank and stored. However, this batch method requires a large tank, and it is necessary to install a tank for each batch. For this reason, when the prescription is diversified, there arises a problem that a large number of tanks and facilities associated therewith must be installed in a propellant filling factory that fills aerosol products with a propellant.
[0004]
[Problems to be solved by the invention]
Therefore, by solving the above-mentioned problem that it is uneconomical in terms of equipment and space, various types of aerosol products that meet the needs of consumers are on-site in the required amount when needed. The development of a compact device that can be manufactured at the same time is desired.
[0005]
However, it is very difficult to solve the above problem by a conventional batch process. Therefore, it is necessary to design a flow process instead of a batch process. In this case, the flow rate of the liquefied gas must be accurately measured. For that purpose, regarding temperature measurement of fluid, meticulous temperature management and pressure management are necessary so that gas and liquid are not mixed during measurement.
[0006]
The present invention has been conceived under the circumstances described above, and two or more kinds of liquefied gases constituting a propellant and the like are stably and accurately measured and mixed by a compact device configuration. It is an object of the present invention to provide a liquefied gas mixing device that can perform the above.
[0007]
DISCLOSURE OF THE INVENTION
In order to solve the above-described problems , according to the present invention , an apparatus for mixing two or more kinds of liquefied gases, each liquefied gas supply source, individual pipes connected to the respective supply sources, Provided in each individual pipe, a liquid feeding means for supplying the liquefied gas from each supply source in a liquid phase at a pressure equal to or higher than the saturated vapor pressure, and provided in each of the individual pipes. A flow rate control means for controlling the flow rate of the flowing liquefied gas, and a common pipe connected to each of the individual pipes, wherein each of the individual pipes is connected to a recycling means downstream of the flow rate control means. The liquefied gas mixing apparatus is characterized in that the recycle means recycles the liquefied gas to the supply sources until the flow rate of the liquefied gas flowing through the individual pipes reaches a predetermined steady state. Is done .
[0008]
On the other hand , according to the first aspect of the mixing method implemented using the mixing apparatus of the present invention, it is a method of mixing two or more liquefied gases, each from an individual supply source containing each liquefied gas. Each liquefied gas is supplied through individual pipes while controlling the flow rate in the liquid phase in a state where a pressure equal to or higher than the saturated vapor pressure of the liquefied gas is supplied, and further supplied to common pipes connected to these individual pipes There is provided a method for mixing liquefied gas, characterized by mixing.
[0009]
In the first aspect, since liquid is sent to each liquefied gas in a state where a pressure equal to or higher than the respective saturated vapor pressure is applied, evaporation can be suppressed and the flow rate can be measured and controlled only in the liquid phase. . Accordingly, each liquefied gas is supplied from the individual pipes to the common pipe, and each liquefied gas is mixed while being sent to the next process, whereby a mixture of liquefied gases having a desired composition can be obtained. For example, when the mixture of liquefied gas is an aerosol propellant, mixing is performed while being sent to the filling step of the aerosol product in the next step, and the aerosol propellant can be prepared on-site. .
[0010]
Further, according to the second aspect of the mixing method implemented using the mixing apparatus of the present invention, it is a method of mixing two or more liquefied gases, each from an individual supply source containing each liquefied gas. Each liquefied gas is supplied via individual pipes while controlling the flow rate in the liquid phase in a state where a pressure equal to or higher than the saturated vapor pressure of the liquefied gas is applied, and stored via a common pipe connected to these individual pipes. A method for mixing liquefied gas is provided, characterized in that it is introduced into the means and mixed.
[0011]
In the second aspect, each liquefied gas is introduced into the storage means through a common pipe and mixed. That is, each liquefied gas is mixed and introduced into the storage means through individual piping and common piping while measuring and controlling the flow rate of the liquefied gas from the supply source of each liquefied gas as described above. Furthermore, mixing may be promoted by mechanical stirring or the like in the storage means. In this case, a predetermined amount of each liquefied gas may be introduced simultaneously into the storage means, or may be introduced individually with a time difference.
[0012]
In the second aspect, the pressure inside the storage means is the highest vapor pressure of the liquefied gas by supplying an inert gas or a component having the highest vapor pressure of the liquefied gas as a pressurized gas. It is preferable to be maintained at a pressure equal to or higher than the saturated vapor pressure indicated by the high component. By doing so, the pressure in the individual piping and common piping of each liquefied gas will be maintained at or above the saturated vapor pressure of each liquefied gas, and the gas-liquid will not be mixed. Measurement and control can be performed stably. Moreover, the composition change by the component evaporation from a mixture can be suppressed or reduced.
[0013]
Moreover, in the said 1st side surface and 2nd side surface, mixing of each liquefied gas can be performed favorably by providing a 1st mixer in common piping. In addition to the first mixer, a second mixer is also provided on the downstream side of the first mixer in the common pipe, and the liquefied gas mixed in the first mixer is further mixed with the second mixer. When mixed in a vessel, mixing of each liquefied gas is further promoted, and more preferable results are obtained.
[0014]
Furthermore, in the first side surface and the second side surface, the liquefied gas flowing through each individual pipe is recycled to the supply source before being supplied to the common pipe, and the flow rate of each liquefied gas becomes a predetermined steady state. first time Te, that to supply the liquefied gas into the common pipe. In this way, the flow rate of each liquefied gas is set to a steady state and more accurate flow rate control is performed, and then the flow of each liquefied gas is simultaneously switched and supplied to the common pipe and mixed, or via the common pipe When introduced into the storage means and mixed, each liquefied gas can be more suitably mixed.
[0015]
This onset Ming is preferably used when mixing the liquefied gas as a component gas aerosol propellant. Examples of the liquefied gas constituting the aerosol propellant include hydrocarbons such as propane, n-butane and isobutane, ethers such as dimethyl ether and diethyl ether, chlorocarbons such as methyl chloride, and Freon 11 (CCl ₃ F). Fluorocarbons such as chlorofluorocarbon 12 (CCl ₂ F ₂ ), carbon dioxide gas, and the like.
[0016]
However, the mixing method carried out using the mixing apparatus of the present invention is not limited to mixing the component gas of the aerosol propellant, but is a general liquefied gas such as sulfur dioxide, hydrogen sulfide, nitrous oxide, ammonia, ethylene , Ethylene oxide, isobutene and the like can also be used.
[0017]
In the mixing device of the present invention, by introducing an inert gas such as nitrogen gas or argon gas or a component having the highest vapor pressure among the liquefied gas components into the storage means, the component having the highest vapor pressure is obtained. Since it can be maintained at a pressure equal to or higher than the saturated vapor pressure, it also serves as a buffer tank.For example, when mixed liquefied gas is used as an aerosol propellant, even if pressure fluctuations occur in the subsequent filling process, the effect The effect of preventing the liquefied gas from being mixed with the liquefied gas is also obtained.
[0018]
[0019]
[0020]
[0021]
Moreover, each said flow control means can be comprised with a mass flow measuring device and a flow control valve, for example.
[0022]
It said recycling means, the downstream side with respect to the respective flow control means, the on-off valve, pressure regulator, including a pipe.
[0023]
Furthermore, in the mixing apparatus of the present invention, as the pressurizing means inside the storage means, a part or all of the storage means can be expanded and contracted, and the volume of the storage means can be made variable. In this case, in the storage means, the amount of the component having the highest vapor pressure among the inert gas or each of the liquefied gases is made constant, and the volume of the storage means is made variable so that the pressure inside the storage means is changed. It is also possible to adopt a method of maintaining the pressure higher than the saturated vapor pressure indicated by the component having the highest vapor pressure. In this case, after pressurizing with a certain amount of inert gas in advance, there is an effect that the operation of additional introduction, purging, etc. of the inert gas or the component having the highest vapor pressure among the above liquefied gases becomes unnecessary. .
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0025]
FIG. 1 shows a flowchart according to a mode in which each liquefied gas is supplied from an individual pipe to a common pipe and mixed (first embodiment). FIG. 2 shows a flowchart according to a mode in which each liquefied gas is introduced into the storage means via a common pipe connected to the individual pipe and mixed (second embodiment). FIG. 3 shows a flowchart according to a mode in which one more pressurizing means for pressurizing the inside of the storage means is arranged in parallel in the second embodiment (third embodiment).
[0026]
In the first embodiment, as shown in FIG. 1, each liquefied gas stored in each storage tank (supply source) 1a, 1b, 1c is supplied as liquid from the lower part of each storage tank. 2b and 2c are entered, pressurized, supplied to the individual pipes ILa, ILb, and ILc, and then supplied to the common pipe CL. At this time, as the liquid feeding means, for example, a normal liquid transport pump such as a spiral pump is used. Next, the mass flow rate is measured by the flow rate control means including the mass flow rate measuring devices 3a, 3b, 3c and the flow rate control valves 4a, 4b, 4c, and the flow rate of each liquefied gas is controlled. As the mass flow meter, a mass flow meter is usually used, and the type thereof is not particularly limited, and various types such as a Coriolis method, an angular momentum method, and a gyro method are used.
[0027]
Relief valves 21a, 21b, and 21c are provided at the discharge portions of the liquefied gas feeding means 2a, 2b, and 2c. The set pressures of the relief valves 21a, 21b, 21c are set slightly higher than the pressures of the individual pipes (ILa, ILb, ILc) when the flow rate control valves 4a, 4b, 4c control the flow rate of each liquefied gas, Each liquefied gas is not in a gas-liquid mixed state, and the pressure is maintained so that the flow rate is always controlled as a liquid. In addition, when an unexpected situation occurs on the downstream side and the flow of each liquefied gas is stopped, it also serves as a safety valve that bypasses each storage tank (supply source) 1a, 1b, 1c.
[0028]
The measurement value of the mass flow rate is sent to the flow rate controllers 5a, 5b, and 5c associated with the flow rate control valves 4a, 4b, and 4c, and the flow rate controllers 5a, 5b, and 5c receive the mass of each liquefied gas input in advance. The opening degree of the flow rate control valves 4a, 4b, 4c is adjusted so that the set value of the flow rate is equal to the measured value. After a certain period of time, the measured value of the mass flow rate of each liquefied gas is controlled to a value approximately equal to the set value. While the flow rate control is performed, each liquefied gas is supplied to the recycle means Ra, Rb, Rc including the on-off valves 6a, 6b, 6c, the pressure regulators 8a, 8b, 8c and the recycle pipes RLa, RLb, RLc. And returned to the storage tanks (supply sources) 1a, 1b, 1c.
[0029]
Recycling means Ra, Rb, Rc are kept constant by pressure regulators 8a, 8b, 8c at a pressure higher than the saturated vapor pressure of the liquefied gas component having the highest vapor pressure. The pressure cannot be generally specified depending on the type of liquefied gas to be mixed, but is usually in the range of 0.2 to 3 MPa (refers to gauge pressure, and the same applies hereinafter). Further, this pressure is slightly higher than the internal pressure of the mixed liquefied gas storage means 11 to be described later, and the pressure regulators 8a, 8b, 8c are used as the primary side (the outlet side of the flow control valves 4a, 4b, 4c). It is preferable to use an autonomous pressure regulating valve that detects the pressure of) and automatically adjusts the pressure to a pressure input in advance.
[0030]
As described above, after the measured value and the set value of the mass flow rate of each liquefied gas coincide with each other and the steady state is reached, each liquefied gas recycling the recycling means Ra, Rb, Rc is supplied to the common pipe CL. At the same time, the flow is switched. For switching the flow of each liquefied gas, the open / close valves 6a, 6b, 6c of the recycling means Ra, Rb, Rc are closed simultaneously, and the open / close valves 7a, 7b, 7c of the individual pipes ILa, ILb, ILc are simultaneously opened. It is done by becoming. As a result, each liquefied gas is supplied to the common pipe CL, and is mixed in the first mixer 9 and the second mixer 10 while flowing in the common pipe CL.
[0031]
The above switching instruction is usually made by means such as a timer or computer control. The on-off valves 6a, 6b, 6c of the recycling means Ra, Rb, Rc and the on-off valves 7a, 7b, 7c of the individual pipes ILa, ILb, ILc, which have received the switching instruction, are valved by a usual method such as electromagnetic or pneumatic. Open and close to switch the flow of each liquefied gas at the same time.
[0032]
In the first mixer 9 provided in the common pipe CL, nozzles into which the respective liquefied gases are individually introduced are disposed in the pressure vessel in parallel with the flow of the liquid, and the nozzles are as described above. Therefore, preliminary mixing is performed in a state where the dynamic pressure of each liquefied gas does not affect the flow.
[0033]
Similarly, the second mixer 10 provided in the common pipe CL is preferably an in-line mixing type mixer for mixing under pressure. In other words, while the fluid passes through the pipeline, the fluid itself uses the flow energy of the fluid by a number of mixing elements (elements) installed in the pipeline, and the fluid itself repeats division, inversion, and conversion while mixing. A static mixer is preferably used.
[0034]
In this way, the liquefied gas supplied and mixed to the common pipe CL is connected to the common pipe CL via the shut-off valve 16, for example, a filling process for filling the aerosol product with a propellant ( (Not shown).
[0035]
Next, a second embodiment shown in FIG. 2 will be described. As shown in FIG. 2, the second embodiment has a configuration in which the storage means 11 is provided between the common pipe CL and the shutoff valve 16, and other configurations are the same as those in the first embodiment. It is. Therefore, the description about the part which overlaps with 1st Embodiment is abbreviate | omitted.
[0036]
In the second embodiment, each liquefied gas supplied to the common pipe CL is introduced into the storage means 11 after being mixed by both the mixers 9 and 10. At this time, it is preferable to pressurize by introducing an inert gas such as nitrogen gas or argon gas or a component gas having the highest vapor pressure of each liquefied gas into the storage means 11. The pressure is kept above the saturated vapor pressure indicated by the component having the highest vapor pressure among the liquefied gases. By doing so, the mixed liquefied gas can be stably stored in a liquid state.
[0037]
As the inert gas, nitrogen gas is usually used. When the pressure controller 15 detects the internal pressure of the storage unit 11 and the pressure is reduced so as to be a preset pressure, the pressure control valve 13 is moved from the pressurizing unit 17 such as a nitrogen gas cylinder, liquid nitrogen or PSA system. The nitrogen gas is introduced via the pressure control valve, and when the pressure rises, the pressure control valve 14 purges the nitrogen gas. By performing such an operation, the internal pressure of the storage means 11 can be maintained at a set pressure.
[0038]
Further, as the pressurized gas, a component having the highest vapor pressure among the liquefied gases can be used as the pressurized gas instead of the inert gas. In this case, a gas cylinder of the component gas may be used as the pressurizing means 17.
[0039]
Next, the third embodiment shown in FIG. 3 is a form in which one more pressurizing means for pressurizing the inside of the storage means in the second embodiment is arranged in parallel. In the third embodiment, as shown in FIG. 3, a first pressurizing means 17 using an inert gas and a pressurizing means 18 using a component gas having the highest vapor pressure are provided so as to be switchable. In this way, by arranging the pressurizing means in parallel and operating the switching valves 19 and 20, it is possible to appropriately select a case where an inert gas is used as the pressurized gas and a case where a component gas is used.
[0040]
In the second and third embodiments, when the pressure of the inert gas is used for maintaining the pressure inside the storage means, the composition of the mixture of each liquefied gas component is not substantially affected. However, when the component having the highest vapor pressure of the above liquefied gas is used as the pressurized gas instead of the inert gas, the composition gas is affected because the component gas for pressurization supplied in a gaseous state is partially condensed. Therefore, a mixture of liquefied gas having a desired composition can be obtained by setting the flow rate of the component having the highest vapor pressure to the common pipe in consideration of the influence.
[0041]
In the second and third embodiments, a pressure-resistant tank is usually used as the storage means 11, and the liquid level of the mixed liquefied gas is detected and the on-off valves 6a, 6b, 6c, the on-off valves 7a, 7b, 7c, and shut off. A liquid level detector 12 for controlling the valve 16 is provided. When the liquid level reaches the upper limit, the liquid level detector 12 closes the on-off valves 7a, 7b, 7c, opens the on-off valves 6a, 6b, 6c, returns the liquefied gases to the recycling means, and stops mixing. At the same time, when the liquid level falls below the lower limit, the shutoff valve 16 is closed and the liquid phase portion is secured. When the liquid level is at an appropriate level within the upper limit and the lower limit, the mixed liquefied gas is sent, for example, as an aerosol propellant through the shut-off valve 16 to an aerosol product filling step (not shown).
[0042]
Hereinafter, the present invention will be described in more detail based on examples.
[0043]
[Example 1]
In accordance with the embodiment shown in FIG. 2, three liquefied gases were mixed to produce an aerosol propellant having the composition shown in Table 1 below. (Production amount 25kg / min)
[0044]
[Table 1]

[0045]
Propane (a), butane (b) and dimethyl ether (c) are stored in the respective storage tanks 1a, 1b and 1c, and are pressurized to 1.1 MPa by the liquid feeding means 2a, 2b and 2c, and are individually piped ILa. , ILb and ILc, and the recycling means Ra, Rb and Rc were recycled. At this time, the flow rate controllers 5a, 5b, and 5c attached to the flow control valves 4a, 4b, and 4c are inputted with set values so that each liquefied gas has the above-mentioned weight%, and the mass flow rate measuring devices 3a, 3b The flow rate of each liquefied gas was controlled so that the measured value of each liquefied gas measured by 3c (manufactured by Oval, Micro Motion flow meter) was equal to the above set value. The pressures of the recycling means Ra, Rb, Rc were set to 1.05 MPa by the pressure regulators 8a, 8b, 8c, respectively.
[0046]
After the recycling was performed for 2 minutes, when the measured value of the mass flow rate of each liquefied gas became equal to the set value, the flow of each liquefied gas flowing through the recycle piping RLa, RLb, RLc was switched to the common piping CL. The switching instruction was given by a timer, and the on-off valves 6a, 6b, 6c were simultaneously closed, and the on-off valves 7a, 7b, 7c were simultaneously opened to introduce three types of liquefied gas into the common pipe CL.
[0047]
Each liquefied gas was first mixed in the first mixer 9 and then further mixed in the second mixer 10. As the second mixer 10, a static mixer (manufactured by Noritake Company Limited, Noritake Static Mixer) was used. The mixed liquefied gas mixed by the first mixer 9 and the second mixer 10, supplied to the common pipe CL, and mixed was stored in the storage unit 11. The storage means 11 was held at a constant pressure of 1 MPa with nitrogen gas.
[0048]
On the other hand, when the mixed liquefied gas was stored in the storage means 11, the mixed liquefied gas was sampled from the outlet of the second mixer 10, and each component was analyzed by gas chromatography. The measured values shown in Table 2 were as follows. Obtained.
[0049]
[Table 2]

[0050]
From this result, by carrying out the present onset bright, a batchwise components in a pressure vessel, charged were weighed one by one component in ascending order of vapor pressure, shaking, almost to the conventional method of stirring, liquefied same accuracy It became clear that gas could be mixed.
[0051]
【The invention's effect】
As described above, according to the present invention, mixing of the liquefied gas can be performed on-site and in a compact amount by a necessary amount when necessary. As a result, for example, it has become possible to eliminate the waste of equipment and space, such as mixing a conventional aerosol propellant batchwise with several types of liquefied gas for each formulation and storing them in each tank.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a first embodiment of the present invention.
FIG. 2 is a flowchart showing a second embodiment of the present invention.
FIG. 3 is a flowchart showing a third embodiment of the present invention.
[Explanation of symbols]
1a, 1b, 1c Liquefied gas storage tank (supply source)
2a, 2b, 2c Liquid feeding means 3a, 3b, 3c Mass flow meter 4a, 4b, 4c Mass flow control valve 5a, 5b, 5c Flow controller 6a, 6b, 6c Open / close valve 7a, 7b, 7c Open / close valve 8a, 8b, 8c Pressure regulator 9 First mixer 10 Second mixer 11 Storage means 12 Liquid level detectors 13, 14 Pressure control valve 15 Pressure regulator 16 Shut-off valve 17, 18 Pressurization means 19, 20 Switching valve ILa, ILb, ILc Individual piping CL Common piping RLa, RLb, RLc Recycling piping Ra, Rb, Rc Recycling means

Claims (7)

An apparatus for mixing two or more liquefied gases,
A supply source of each of the above liquefied gases;
Individual piping connected to each of the above supply sources;
A liquid sending means provided in each of the individual pipes for supplying the liquefied gas from each supply source in a liquid phase at a pressure equal to or higher than its saturated vapor pressure;
A flow rate control means for controlling the flow rate of the liquefied gas flowing through the individual pipes provided in each of the individual pipes;
A common pipe connected to each individual pipe ,
Each individual pipe is connected to a recycle means downstream of each flow control means, and the recycle means supplies each liquefied gas until the flow rate of the liquefied gas flowing through each individual pipe reaches a predetermined steady state. An apparatus for mixing a liquefied gas, wherein the above-mentioned supply sources are recycled . The liquefied gas mixing apparatus according to claim 1 , wherein the common pipe includes a first mixer for mixing the liquefied gas supplied from the individual pipes. The liquefied gas mixing apparatus according to claim 2 , wherein the common pipe includes a second mixer for further mixing the liquefied gas mixed in the first mixer. The liquefied gas mixing apparatus according to any one of claims 1 to 3 , further comprising a storage unit connected to the common pipe. The liquefied gas mixing apparatus according to claim 4 , further comprising a pressurizing means for maintaining the pressure inside the storage means at a pressure equal to or higher than a saturated vapor pressure indicated by a component having the highest vapor pressure in the liquefied gas. The liquefied gas mixing device according to claim 5 , wherein the pressurizing means supplies an inert gas or a component having the highest vapor pressure of the liquefied gas as the pressurized gas. Each said flow control means is a liquefied gas mixing apparatus of any one of Claims 1-6 containing a mass flow measuring device and a flow control valve.

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